The case of the alleged poisoning of former Russian spy, Alexander Litvinenko is certainly gathering its share of UK media attention. Mr Litvinenko's doctors are now reporting that the heavy metal thallium may not be the cause of his condition as was initially suspected.
Still, if this news item has piqued your interest in the deadly world of toxic heavy metals, then CAB Abstracts can point you in the direction of many related articles in such fields as environmental contamination, agriculture and veterinary science.
"Uptake of thallium from naturally-contaminated soils into vegetables" - Pavlickova et al. Food Additives and Contaminants, 2006; 23(5): 484-491.
"Thallium: a review of public health and environmental concerns" - Peter and Viraraghavan. Environment International. 2005; 31(4): 493-501
And if you're still interested, this Darwin Awards article might give you a chuckle.